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    <script>
        console.log(1 + 1)
        console.log("str" + 1)  //+ 隐式转换
        console.log("2" + 1)  //+ 隐式转换 数字转字符串
        console.log("2" - 1)  //- * / % 隐式转换 字符串转数字
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